The present invention relates to a pedal device of a construction equipment and, more specifically, to a pedal device of a construction equipment which can be easily and conveniently locked and unlocked. To this end, the present invention provides a pedal device of a construction equipment, which comprises: a hydraulic adjusting block fixed to a bottom plate installed on the inner bottom surface of a cabin, and having a hydraulic adjusting unit disposed therein for driving a working device connected to the construction equipment; a pedal assembly rotatably connected to the hydraulic adjusting block for operating the hydraulic adjusting unit by rotating when the pedal is pressed by a driver's foot; and a locking unit which comprises a first locking portion converted into a locking mode and an unlocking mode and fixed to the hydraulic adjusting block, and a second locking portion fixed to the pedal assembly, wherein in the locking mode, the second locking portion is connected to the first locking portion throug
